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Structure and reaction dynamics of SHE Z = 130
R.R. Swain, B. B. Sahu
Published:   , doi: 10.1088/1674-1137/43/10/104103
Abstract:
In this piece of writing, we look into the structural properties of super-heavy nuclei with Z = 130 by adopting the relativistic mean-field (RMF) theory within an axially deformed oscillator basis with the NL3 force parameter set. We study the binding energies, quadrupole deformation, nuclear radii, neutron separation energies, and other bulk properties. Also, we analyze the favorable decay modes for clear cognitive content of nuclei such as alpha decay by using different formulae like Viola-Seaberg, the analytical formula of Royer, Universal curve formula, Universal decay law and compared with the corresponding fission process. The spontaneous fission of super-heavy nuclei with \begin{document}$ Z = 130 $\end{document} within the mass region \begin{document}$ 310 \leq A \leq 340 $\end{document} is studied. The results show a good consistency with Finite Range Droplet Model (FRDM) data. This formalism presents a significant step forward in the study of structure and decay modes of the isotopes of Z = 130. With this appraisal, we also investigate the possible shell/sub-shell closure for the super-heavy nuclei adjacent by decay chains of alpha and other radioactive decay particles.
A coupled-channel lattice study on the resonance-like structure Zc(3900)
Ting Chen, Ying Chen, Ming Gong, Chuan Liu, Liuming Liu, Yu-Bin Liu, Zhaofeng Liu, Jian-Ping Ma, Markus Werner, Jian-Bo Zhang, (CLQCD Collaboration)
Published:   , doi: 10.1088/1674-1137/43/10/103103
Abstract:
In this exploratory study, near-threshold scattering of D and \begin{document}$\bar{D}^*$\end{document} meson is investigated using lattice QCD with \begin{document}$N_f=2+1+1$\end{document} twisted mass fermion configurations. The calculation is performed within the coupled-channel Lüscher's finite-size formalism. The study focuses on the channel with \begin{document}$I^G(J^{PC})=1^+(1^{+-})$\end{document} where the resonance-like structure \begin{document}$Z_c(3900)$\end{document} was discovered. We first identify the most relevant two channels of the problem and the lattice study is performed within the two-channel scattering model. Combined with a two-channel Ross-Shaw theory, scattering parameters are extracted from the energy levels by solving the generalized eigenvalue problem. Our results on the scattering length parameters suggest that, at the particular lattice parameters that we studied, the best fitted parameters do not correspond to a peak behavior in the elastic scattering cross section near the threshold. Furthermore, within the zero-range Ross-Shaw theory, the scenario of a narrow resonance close to the threshold is disfavored beyond \begin{document}$\sigma$\end{document} level.
Study of $ \bar{B}_{u,d,s}^* \to D_{u,d,s}^* V\,(V = D_{d,s}^{*-}\,,K^{*-}\,,{\rho}^-) $ weak decays
Qin Chang, Yunyun Zhang, Xiaonan Li
Published:   , doi: 10.1088/1674-1137/43/10/103104
Abstract:
Motivated by the rapid development of heavy flavor physics experiment, we study the tree-dominated nonleptonic \begin{document}$ \bar{B}_{u,d,s}^* \to D_{u,d,s}^*V $\end{document} (\begin{document}$ V = D^{*-},D_s^{*-},K^{*-},{\rho}^- $\end{document}) decays within the factorization approach. The relevant transition form factors are calculated by employing the covariant light-front quark model. The helicity amplitudes are calculated and analyzed in detail, and a very clear hierarchy structure \begin{document}$ |H_{-0}| \approx 2|H_{00}| > |H_{0-}|\approx|H_{–}|>|H_{0+}|\approx|H_{++}| $\end{document} is presented. The branching fractions are computed and discussed. Numerically, the CKM-favored \begin{document}$ \bar{B}^*_q\to D^*_q \rho^{-} $\end{document} and \begin{document}$ D^*_q D_s^{*-} $\end{document} decays have relatively large branching fractions, \begin{document}$ \gtrsim {\cal O}(10^{-8}) $\end{document}, and are hopeful to be observed by LHC and Belle-II experiments in the future.
Thermodynamics and weak cosmic censorship conjecture of the BTZ black holes in the extended phase space
Xiao-Xiong Zeng, Yi-Wen Han, De-You Che
Published:   , doi: 10.1088/1674-1137/43/10/105104
Abstract:
As a charged fermion drop into a BTZ black hole, the laws of thermodynamics and the weak cosmic censorship conjecture are checked in both the normal phase space and extended phase space, where the cosmological parameter and renormalization length are regarded as extensive quantities. In the normal phase space, the first law, second law, and the weak cosmic censorship are valid. While in the extended phase space, though the first law and weak cosmic censorship conjecture are still valid, the second law is dependent on the variation of the renormalization energy dK. In addition, in the extended phase space, the configurations of the extremal and near-extremal black holes will not be changed for they are stable while in the normal phase space, the extremal and near-extremal black holes will evolve into non-extremal black holes.
Low-lying states of 92,93Nb excited in weakly bound projectile reaction near Coulomb barrier energy
Yi-Feng Lv, Jing-Bin Lu, Gao-Long Zhang, Yi-Heng Wu, Cen-Xi Yuan, Guan-Jian Fu, Guang-Xin Zhang, Zhen Huang, Ming-Li Wang, Shi-Peng Hu, Hui-Bin Sun, Huan-Qiao Zhang, Cheng-Qian Li, Ke-Yan Ma, Ying-Jun Ma, Yun-Zuo Liu, D. Testov, P. R. John, J. J. Valiente-Dobon, A. Goasduff, M. Siciliano, F. Galtarossa, F. Recchia, D. Mengoni, D. Bazzacco
Published:   , doi: 10.1088/1674-1137/43/10/104102
Abstract:
Excited states of odd-odd nucleus 92Nb and odd-A nucleus 93Nb were populated by the 6Li+ 89Y reaction with an incident energy of 34 MeV. By combining the measurements of light-charged particles and gamma rays, the processes producing 92,93Nb are discussed. 20 new transitions are observed and 8 new levels are constructed in 92Nb, and additionally, 2 new transitions are added to the level scheme of 93Nb. Following shell model calculations, the low-lying structure of 92Nb is investigated and compared with experimental results.
Sensitivity study of anomalous HZZ couplings at future Higgs factory
Hua-Dong Li, Cai-Dian Lü, Lian-You Shan
Published:   , doi: 10.1088/1674-1137/43/10/103001
Abstract:
We study the sensitivity of constraining the model independent Higgs-Z-Z coupling based on effective theory up to dimension-6 operators at the future Higgs factory. Utilizing the current conceptual design parameters of the Circular Electron Positron Collider, we give the experimental limits for the model independent operators by the total Higgsstrahlung cross section and angular distribution of Z boson decay in the Higgs factory. Especially, we give very small sensitivity limit for the CP violation parameter \begin{document}$ \tilde g$\end{document}, which will be a clear window to test the Standard Model and look for New Physics signal.
Matter effects and coherent effect of neutrinos produced from gamma-ray bursts
Kuan Liu, Chun-Sheng An, Xin Li, Hai-Nan Lin
Published:   , doi: 10.1088/1674-1137/43/10/105102
Abstract:
Neutrinos produced from gamma-ray bursts (GRBs) carry rich physical information. The electron density in the GRBs outflow is very large. In this paper we calculate the matter effect on neutrinos when they propagate through such a dense region. The average survival probability and the flavor ratio of neutrino are shown. The ratio of resonant neutrino energy from different spherical shells gives the information of power index N for the power-law distribution of electron in the hot fireball model. Electron density in the magnetic jet model are sufficient lower than the one in the hot fireball model. The matter effect on neutrinos can be used to distinguish these two models. The coherent effect of strongly lensed PeV neutrinos is also discussed. The average survival probability of strongly lensed electron neutrinos in the normal hierarchical case and inverted hierarchical case are presented. The results show that such coherent effect could be used to determine the mass hierarchical of neutrinos.
F(R) gravity in the early Universe: electroweak phase transition and chameleon mechanism
Taishi Katsuragawa, Shinya Matsuzaki, Eibun Senaha
Published:   , doi: 10.1088/1674-1137/43/10/105101
Abstract:
It is widely believed that the screening mechanism is an essential feature for the modified gravity theory. Although this mechanism has been examined thoroughly in the past decade, their analyses are based on a conventional fluid prescription for the matter-sector configuration. In this paper, we demonstrate a new formulation of the chameleon mechanism in F(R) gravity theory, to shed light on quantum-field theoretical effects on the chameleon mechanism as well as the related scalaron physics, induced by the matter sector. We show a possibility that the chameleon mechanism is absent in the early Universe based on a scale-invariant-extended scenario beyond the standard model of particle physics, in which a realistic electroweak phase transition, yielding the right amount of baryon asymmetry of Universe today, simultaneously breaks the scale invariance in the early Universe. We also briefly discuss the oscillation of the scalaron field and indirect generation of non-tensorial gravitational waves induced by the electroweak phase transition.
Dark matter and LHC phenomenology of a scale invariant scotogenic model
Chao Guo, Shu-Yuan Guo, Yi Liao
Published:   , doi: 10.1088/1674-1137/43/10/103102
Abstract:
We study the phenomenology of a model that addresses the neutrino mass, dark matter and generation of the electroweak scale in one framework. The electroweak symmetry breaking is realized via the Coleman-Weinberg mechanism in a classically scale invariant theory, while the neutrino mass is generated radiatively through interactions with dark matter in a typically scotogenic manner. The model introduces a scalar triplet and singlet and a vector-like fermion doublet that carry an odd parity of Z2, and an even parity scalar singlet that helps preserve classical scale invariance. We sample over parameter space by taking into account various experimental constraints from dark matter relic density and direct detection, direct scalar searches, neutrino mass and charged lepton flavor violating decays. We then examine by detailed simulations possible signatures at the LHC for some benchmark points of the free parameters. We find that the future high-luminosity LHC will have a significant potential of detecting new physics signals in the dilepton channel.